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    <ol> <li><p>to have the x-axis and y-axis controls on top of each other, you should have two panels, one including the labels and text fields for the x-axis in one and those for the y-axis in the other. You would then add those to a panel that is aligned vertically. (<code>Box.createVerticalBox()</code>, for example)</p></li> <li><p>You can make your <code>graph.java</code> an <code>ActionListener</code> of the 'Plot' and 'Refine' buttons. In the <code>actionPerformed</code> method of graph.java, you can initiate a repaint, gathering the ranges from the 'ControlsB' instance.</p></li> </ol> <p>EDIT: responding to your comments...</p> <p><em>'how to add another panel in order for me to place the x-axis above the y-axis'</em></p> <p>this can be as simple as (in ControlsB.java):</p> <pre><code>b = Box.createHorizontalBox(); b.add(new JLabel("Please enter range: ")); Box b0 = Box.createVerticalBox();//create a vertical box to stack the controls Box b1 = Box.createHorizontalBox(); // create a horizontal box for the x-axis b1.add(new JLabel(" x-axis ")); b1.add(new JLabel("from")); JTextField f1 = new JTextField("-5"); f1.setMaximumSize(new Dimension(100,30)); b1.add(f1); b1.add(new JLabel(" to ")); JTextField f2 = new JTextField("5"); f2.setMaximumSize(new Dimension(100,30)); b1.add(f2); b1.add(new JLabel(". ")); Box b2 = Box.createHorizontalBox(); // create a second horizontal box for the y-axis b2.add(new JLabel("y-axis ")); b2.add(new JLabel("from")); JTextField f3 = new JTextField("5"); f3.setMaximumSize(new Dimension(100,30)); b2.add(f3); b2.add(new JLabel("to")); JTextField f4 = new JTextField("-5"); f4.setMaximumSize(new Dimension(100,30)); b2.add(f4); b0.add(b1); // add the x-axis to the vertical box b0.add(b2); // add the y-axis to the vertical box b.add(b0); // add the vertical box to the parent b.add(new JButton("Plot")); b.add(new JButton("Refine")); add(b); //is this necessary? } </code></pre> <p><em>' and how to gather the ranges from the ControlsB instance...'</em></p> <p>You should look into <code>ActionListener</code>s in <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/actionlistener.html" rel="nofollow">this tutorial</a> to understand how to make the button click events trigger action in a separate class.</p> <p>Also, two critiques:</p> <ol> <li><p>in your main class, <code>GraphApplet</code>, you are creating a <code>Box</code> before passing it into each of <code>ControlsA</code> and <code>ControlsB</code>'s constructor. In the constructor, you then reassign the Box that you've passed in. I don't think that you need to do that. Either create the correctly aligned box in <code>GraphApplet</code>, pass that in and don't reassign, or don't pass anything in at all.</p></li> <li><p>Your <code>ControlsA</code> and <code>ControlsB</code> classes both extend <code>JPanel</code>. Although you go to the trouble of adding your <code>Box</code> containers to each of these at the end of their constructors, you don't ever add those Controls+ objects to any parent container. In your current implementation, i would suggest that extending <code>JPanel</code> is not necessary.</p></li> </ol>
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    1. COThank you for your reply. I am new to java, therefore if possible I would like to ask you for further details on the above answer. Thanks :)
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    2. CO@Matthew: you should ask *specifically* about what isn't clear.
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    3. COhow to add another panel in order for me to place the x-axis above the y-axis and how to gather the ranges from the ControlsB instance...
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